Recent progress of MgO-based materials in CO₂ adsorption and conversion: Modification methods, reaction condition, and CO₂ hydrogenation

Integrated CO₂ capture and conversion of (ICCC) is one of the most effective solutions to reduce anthropogenic CO₂ emissions, which has attracted extensive public attention. Dual functional materials (DFMs), including adsorbent and catalyst, are the key components to achieve ICCC. Magnesium oxide (MgO) is an ideal adsorbent for ICCC, since it is characterized by high theoretical adsorption capacity, low cost, low energy consumption and extensive sources. It can also be used as DFMs in combination with the Ni catalysts. MgO not only can act as an adsorbent in DFMs but also enhance the catalytic performance of Ni. This review summarizes the advantages and modification methods of MgO as adsorbent and the influence of its adsorption conditions on the adsorption performance. Moreover, the important role of MgO in facilitating the catalytic conversion of CO₂ is highlighted. Future research focuses are proposed for the development of MgO based DFMs with high adsorption capacity, high stability, conversion, and selectivity as well as low cost and energy consumption.